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Title: Retrograde Vaporization Of Residual Condensation In Storage Field Development Author: R. A. Herzog Source: American Gas Association 1980Year Published: 1980Abstract: This paper addresses a concept based on phase equilibria, coupled with fluid flow in porous rock formations. Conceptually, native gas reservoirs when depleted will produce some condensate along with natural gas. From phase equilibria, condensate will form in the porous rock as well as in surface separators. From rock mechanics and fluid properties, some of the condensate formed in the rock must be retained where formed. It is this immobile condensate which can revaporize with repressuring on conversion to storage to significantly enrich the storage gas injected.